One key reason for the potential turn is the wave of interest-rate cuts from global central banks. Of the 57 institutions monitored by Bloomberg, more than half cut borrowing costs this year with the Fed doing so three times and the European Central Bank pushing its deposit rate further into negative territory. Rate cuts also operate with a lag so the positive effects of easier monetary policy have yet to fully flow through, meaning a further impulse likely awaits.

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Also driving sentiment is that President Donald Trump and President Xi Jinping are on the cusp of signing "phase one" on a trade deal, which could be enough for global commerce to find a footing. China is reviewing locations in the U.S. where Xi would be willing to meet with Trump to sign a pact.

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"If the U.S.-Chinese trade escalates again, or if the U.S. starts a new trade war against the only other economy of almost equal size, the EU, it could all still go wrong," said Holger Schmieding, chief economist at Berenberg Bank. "But in the absence of such new political shocks, chances are that the global downturn could peter out in early 2020 and make way for a modest upturn thereafter."

Back on the "no recession ever" yellow brick road... all it takes is financial meltdown-level central bank intervention...